1138351381 has 2 divisors, whose sum is σ = 1138351382. Its totient is φ = 1138351380.

The previous prime is 1138351363. The next prime is 1138351387. The reversal of 1138351381 is 1831538311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1052418481 + 85932900 = 32441^2 + 9270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138351381 - 2¹³ = 1138343189 is a prime.

It is a super-2 number, since 2×1138351381² = 2591687733249214322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1138351387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569175690 + 569175691.

It is an arithmetic number, because the mean of its divisors is an integer number (569175691).

Almost surely, 2^1138351381 is an apocalyptic number.

It is an amenable number.

1138351381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138351381 is an equidigital number, since it uses as much as digits as its factorization.

1138351381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 34.

The square root of 1138351381 is about 33739.4632589198. The cubic root of 1138351381 is about 1044.1401108300.

Adding to 1138351381 its reverse (1831538311), we get a palindrome (2969889692).

The spelling of 1138351381 in words is "one billion, one hundred thirty-eight million, three hundred fifty-one thousand, three hundred eighty-one".